The JR-M502-BK set upgrades the rear suspension arms on TAMIYA M-05, M-06 and MF-01X chassis with aluminium components intended to preserve factory mounting locations while adding sturdiness.
These arms are designed for direct replacement and pair with the kit's original rear mounting hardware. The black finish keeps the look subtle while the aluminium aims to provide consistent alignment under load.
In terms of tuning, aluminium rear arms affect how changes in setup translate to on-track behaviour. After fitting, verify hinge pin placement and fastener condition as part of your setup checks.
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